Antenna



Feb.- 11, 1930. ME|$$NER 1,746,436

ANTENNA Filed July 16, 1925 INVENTOR ALEXANDER MEISSNER &4 ,ddaw,

ORNEY "ions.

Patented Feb. 11, 1930 ALEXANDER MEISSNER, 0F BERLIN, GERMANY, ASSIGNOR T0 GESELLSCHAFT FUR DRAHTLOSE TELEGRAPHIE M. B. 1-1., OF BERLIN, GERMANY, A CORPORATION OF GERMANY ANTENNA Application filed July 16, 1925, Serial No. 43,900, and in Germany July 25, 1924.

This invention relates to the transmission of electric waves through space, and particularly where it is desired to transmit long waves and short waves at the same transmitting station.

It has lately become the practice to transmit long waves during some hours, and to transmit short waves during others according to which is more favorably radiated.

Recent practice in the operation of large transmitting stations has been to provide the same with an aerial or antenna adapted for long wave transmission, and also with a second antenna adapted for short wave trans mission, the one being used mostly during the daylight hours and the other mostly during the night hours. The use of antennae is often attended with the practical difficulty of erecting two antennae so that the radiation from the short wave antenna will not be hindered by the aerial wires and metal supporting towers used for supporting the long wave antennae of high power transmitting It is necessary for practical reasons to place the long wave and short Wave antennae in the immediate vicinity of the transmitting station, so that both may be connected with the transmitting apparatus.

The object of the present invention is to so design and position the respective long wave and short wave antennae at a high power transmitting station that the entire aerials and tower system shall act as a reflector or will produce an image for the short waves emitted by the short wave antenna, so that the reflected waves will not be absorbed by the long wave transmitting structure to any considerable extent, and such structure will act to reinforce the waves transmitted from the short wave antenna and produce a directive eifect to reinforce the transmitted short waves in the direction of the desired reception. The engineering principles involved in so arranging the short wave antenna as to distance and proportions will be apparent to those skilled in the art, it being necessary, in some instances, to adapt the wave length of the radiating antennae to produce the reflecting effect in the long wave antenna structure.

Fig. 1 is a pictorial representation with an embodiment of my invention.

Fig. 2 is a plan thereof.

From the foregoing statement taken in connection with the drawings, in which the transmitting stations are designated by numerals of l and 5, the aerial supporting towers 3 and 4 the long wave high power aerial 2 and the short wave aerial 6 insulated from the former aerial by an insulator 7, one skilled in the art can readily discern the engineering principles involved and construct an aerial system with the proper proportions and relations so that the larger aerial will cooperate with the low wave length aerial to produce directional and reflective results without substantial absorption.

What I claim and desire to protect by Letters Patent is: i

1. An antenna system for electric wave transmission through space comprising, a long wave aerial and its supporting means, and a short wave antenna located in the vicinity of the former, said antennae being so placed in relation to each other as to produce a reflection, of short waves without substantial absorption, in the direction of the desired reception.

2. An aerial system for electric wave transmission through space comprising, a long wave antenna, and its supporting means and a short wave antenna supported by the latter, said antennae being so porportioned and located relatively to each other as to produce a reflection of short waves, without substantial absorption, in a desired direction.

3. An antenna system for electric wave transmission through space comprising a long wave antenna and its supporting means, and a short wave antenna located in a plane passing through said supporting means, said short wave antenna being supported by said supporting means, said long wave antenna and its supporting means being so proportioned J and arranged with respect to the short wave antenna that said short wave antenna has a directional characteristic.

4. In combination, a long wave antenna comprising a plurality of parallel conductors and a pair of supporting towers, and a short Wave antenna comprising a single conductor attached to and insulated from one of the towers whereby the long Wave antenna acts as a reflector for the short ave antenna. Signed at Berlin, Germany, this 23rd day of June, 1925.

ALEXANDER MEISSNER.

CERTIFICATE OF CORRECTION.

Patent No. 1,746,436. Granted February 11, 1930, to

ALEXANDER MEISSNER.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, line 70, claim 1, for "antenna" read aerial, and line 72, for "aerial" read antenna; and that the said Letters Patent. should be read with these corrections therein that the same may conform to the recerd of the case in the Patent Office.

Signed and sealed this 19th day of August, A. D. 1930.

M. J. Moore, (Seal) Acting Commissioner of Patents.

CERTIFICATE OF CORRECTION.

Patent No. 1,746,436. Granted February 11, 1930, to

ALEXANDER MEISSNER.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, line 70, claim 1, for "antenna" read aerial, and line 72, for "aerial" read antenna; and that the said Letters Patent. should be read with these corrections therein that the same may conform to the recerd of the case in the Patent Office.

Signed and sealed this 19th day of August, A. D. 1930.

M. J. Moore, (Seal) Acting Commissioner of Patents.

CERTIFICATE OF CORRECTION.

Patent No. 1,746,436. Granted February 11, 1930, to

ALEXANDER MEISSNER.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, line 70, claim 1, for "antenna" read aerial, and line 72, for "aerial" read antenna; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 19th day of August, A, D. 1930.

M. J. Moore, (Seal) Acting Commissioner of Patents. 

